class_docstr: Evaluator base class.
code: def hparams(self):
      return self.wmodel.hparams
  
imports: import time
  from magenta.models.coconet import lib_tfutil
  from magenta.models.coconet import lib_util
  import numpy
  from scipy.misc import logsumexp
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling the BaseEvaluator obj's underlying member method code with example usage: obj.hparams() and returns: self